Improve command line build examples

SC2086.md

@@ -44,20 +44,25 @@ Sometimes you want to split on spaces, like when building a command line:
 
 ```sh
 options="-j 5 -B"
+[[ $debug == "yes" ]] && options="$options -d"
 make $options file
 ```
 
 Just quoting this doesn't work. Instead, you should have used an array (bash, ksh, zsh):
 
 ```bash
-options=(-j 5 -B) # ksh: set -A options -- -j 5 -B
+options=(-j 5 -B) # ksh88: set -A options -- -j 5 -B
+[[ $debug == "yes" ]] && options=("${options[@]}" -d)
 make "${options[@]}" file
 ```
 
 or a function (POSIX):
 
 ```sh
-make_with_flags() { make -j 5 -B "$@"; }
+make_with_flags() {
+  [ "$debug" = "yes" ] && set -- -d "$@"
+  make -j 5 -B "$@"
+}
 make_with_flags file
 ```